| How to prevent the filechooser resolving symblic links |
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- Java 5.0 released
http://news.com.com/New+Java+looks+to+shake+up+desktop/2100-1007_3-5389888.html
- 2
- Special characters: how to read them into JTable?Hello everybody,
I would like to read String data from a file into a JTable (using Vectors).
These data contain special characters,
mainly Greek symbols. Ideally, I would also like to display subscripts as
well, if possible.
Does anybody knows how this can be done?
Thanks in advance,
Maria
- 2
- Calling own-constructors inside another constructorHi all,
Inspecting some pieces of code from someone I found things like this:
class A {
private String id = "";
public A() {
super();
}
public A(String id) {
this.id = id;
}
}
class B extends A {
public B() {
this(""); <-------------------- HERE!
}
public B(String id) {
super(id);
}
}
Inside constructor B() it's calling a constructor. Could this cause some collateral or strange problems?
I know it's nonsense because id attribute it's being initialized by default to "", but I'd like to know if
also is a problem.
- 3
- how to fire JTree child node eventI have a JTree where each node displays a specific view when selected.
I'd like to somehow fire an event to default the app which view to
display when opened.
How do I fire an event for a JTree as if the user clicked on a specific
child node?
- 4
- stdout and stderr don't occur sequentially in Eclipse and NetbeansZelluX wrote:
> But System.err is unbuffered, so I don't think it will have any effect
> to flush after every write.
There is nothing in the Javadocs to indicate that System.err is unbuffered.
Like System.out, System.err is a java.io.PrintStream. The docs for
PrintStream imply that instances are buffered, else the flush() method would
be meaningless. So it is not accurate, or at least not safe to say that
System.err is unbuffered.
That leaves auto-flushing. Nothing in the Javadocs for System.err indicates
that it's created with autoFlush on. Did you check the source for your
particular flavor of Java to see if it is?
In my installation, the source shows:
setErr0(new PrintStream(new BufferedOutputStream(fdErr, 128), true));
Whaddaya know? System.err is buffered in my installation.
Sun Java JDK 1.6.0_10b25, 64 bit, Linux.
Are you quite certain that System.err is unbuffered in your Java installation?
--
Lew
- 6
- Where Does the Code Go?I have a good programming practice question. Just for fun, Ive taken on a
side project that will help a teacher friend of mine work out grades. I
want a GUI interface that will store and retrieve grading info. So Im
hoping someonecan walk me through my class structure. My biggest question
regards whether or not it is good programming practice to have data objects
as members of my GUI class or if it should be done another way? I have my
main class which calls the GUI class. For now in my most basic skeleton, I
have a very simple student class, contains has a grade class. How should
these classes be arranged?
My first thought was have student a member of the GUI class. Say I have a
form with nothing more then two text fields for name and grade, and a
button. When I click the button, I want to store the the textfield data in
the student/grade classes. I can do that fine if student is a member of the
GUI class, but for some reason Im uncomfortable with this design. It seems
the GUI should be design only, no data access code in there. Eventually I
want to add database connection objects to this model for permanent student
data storage and would need to know where those would be called from as
well. So what do you guys think?
Classes:
Main
Gui
Student -> Grade
How to arrange?
Thanks
Rv5
- 6
- Great time in FranceHello
I had a fantastic time in France, hope to visit again soon.
I found a holiday cottage from these guys www.looktogo.co.uk
Regards,
Dancer: ).
- 7
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- 10
- list box values to be allignedhi,
my list box in the html page contains list box with values. these
values inturn have subvalues and I have to allign the child values to
right so that i can know the parent of the values. how can I do that.
list values should look something like this...
(suppose u have a list box with the state names in usa. the cities of
the states would be the child elements and the state names would be the
parent values)
ALABAMA
Abbeville
Huntsville
Birmingham
Montgomery
......
ALASKA
Anchorage
Tucson
.....
.......
........
........
Urgent can someone help pls. I can use java script or any java
technology
thanks..
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- 11
- J2EE architecture questionHello.
Iv read a spec from a firm which wants to build a J2EE application,
but the application is not supposed to be web based. The reason for
this is mostly a very complex UI.
From what ive read about the J2EE architecture ,the presentation layer
has always been servlets or jsp.
Is it a posibility / option to build a J2EE application without the
web based presentation layer?
- 11
- Multiple thread handle problemhi
I am starting a no.of threads(500) from my application. i want to
start a new thread as soon as one of these threads dies.Any of the
thread could die at any particular time.Currently i am using a loop
to check which of the threads is alive and i can use join() for
others.I don't want to use a loop as that is eating a lot of memory.
Using synchronization method is it possible to block (creation of new
thread) untill one of the current thread dies.
Please help...
Anks
- 13
- fixing image sizeI realise there have been several posting on this subject already.
However, despite these, I still can't quite work out how to do this.
I need to take the image from a file (.gif .jpg etc), ensure that the
entire image fits on a JPanel of some size, then put this JPanel onto
another Jpanel.
From what I could gather, it looked like I had to extend JPanel and
override paint(). The problem comes when I try to use drawImage().
Here's the code.
//relevent imports
public class Picture extends JPanel
{
private String fileName;
/** Creates a new instance of Picture */
public Picture(String file)
{
fileName=file;
}
public void paint(Graphics g)
{
super.paintComponent(g);
}
}
- 16
- Problem with focus on JListHi!
I got 2 JLists . I doubleclick an item to display it's details.
This works fine so far, but:
When I select an item in JList1 and in JList2 the Mouselistener doesn't
know from which JList he should get the item.
So I had the idea that when you select an item in JList1 JList2 should
loose all selections.
But I just don't get it done.
any ideas?
|
| Author |
Message |
Zoran Pjevic
|
 Posted: 2004-9-15 20:45:00 |
Top |
java-programmer, How to prevent the filechooser resolving symblic links
Hello everybody
I am using a filechooser object to select files.
JFileChooser _fileChooser = new JFileChooser();
File[] selectedfiles = _fileChooser.getSelectedFiles();
for (int i =0 ; i < selectedfiles.length; i++) {
//path = selectedfiles[i].getCanonicalPath();
path = selectedfiles[i].getPath();
}
The _fileChooser.getSelectedFiles() returns already absolute path
names. So no matter if I call getPath or getCanocialPath I get the
abosolute path names.
But I want to display symbolic links as relative pathnames.
Is there a way to accomplish this?
Any help I will welcome.
Thanks in advance,
Zoran
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John McGrath [TeamB]
|
| Posted: 2004-9-21 10:22:00 |
Top |
java-programmer >> How to prevent the filechooser resolving symblic links
On 9/15/2004 at 8:45:04 AM, Zoran Pjevic wrote:
> I am using a filechooser object to select files.
> The _fileChooser.getSelectedFiles() returns already absolute path
> names. So no matter if I call getPath or getCanocialPath I get the
> abosolute path names.
>
> But I want to display symbolic links as relative pathnames.
Assuming that JFileChooser did return relative paths, it is not very clear
what directory the paths would be relative to. It could be the initial
current directory set on the JFileChooser, although that changes based on
user input and possibly based on other code behavior. It could also be
the current value of the "user.dir" system property or the operating
system's "current working directory", assuming that was defined.
> Is there a way to accomplish this?
I think you will need to write your own getPathRelativeTo(File, File)
method. Be aware that there are some tricky issues here. If there are
symbolic links (or other filesystem oddities) on your path, it may not be
too clear what relative path should be returned. It could return a path
containing the symbolic link, or one based on the canonical path for the
specified path. Also, you need to consider the possibility that there is
no possible relative path, but you probably just want to return an
absolute path in that case.
--
Regards,
John McGrath [TeamB]
---------------------------------------------------
Before sending me e-mail, please read:
http://www.JPMcGrath.net/newsgroups/e-mail.html
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Index ‹ java-programmer |
- Next
- 1
- How to approachLuc The Perverse wrote:
...
>
> WAIT!
>
> I think I got it (I'm not meaning to imply that you didn't help) - and I
> didn't look at anything.
>
> Let's say there are NxN squares, and there are x number of moves.
>
> I can make the square x, y be represented as an integer 0..N * N - 1
>
> So I create a 2D array [N*N][x] of longs which will represent the sum of the
> number of unique paths to the given point.
...
You got it. There is an optimization that reduces the memory cost,
but you have a dynamic programming solution to the problem. And you have
the really big savings from exponential to linear increase in time and
memory as the number of moves increases.
> Hey thanks everyone. This is more than just a single problem or some points
> on a practice problem that doesn't matter anyway. I'm learning how to do
> this, and becoming a better programmer - and that is important to me.
> Learning new abstract concepts, and having exciting revelations is actually
> (though sadly) a bit of a rarity for me.
I think, more than ever after seeing this, that you would benefit from
reading a book on algorithm design.
Patricia
- 2
- String and Char HelpI have a few questions but first here is my code.
public class CountVowels
{
public static void main(String[] args)
{
int vowel = 0;
int i;
char pos;
String String1 = "Event Handlers is dedicated to making your
event a most memorable one.";
int length = String1.length();
for(i = 0; i < length - 1 ; i++);
{
pos = String1.charAt(i);
if (pos == 'A' || pos == 'a' || pos == 'E' || pos == 'e' ||
pos == 'I' || pos == 'i' || pos == 'O' || pos == 'o' || pos == 'U' ||
pos == 'u') {
vowel += 1;
}
}
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Question one is why does String1.length() return 70 when there are
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Thanks in advance
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>On Wed, 30 Apr 2008 08:00:38 -0700 (PDT), Isaac Gouy
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>Why don't you go through all...
startup benchmark...
http://shootout.alioth.debian.org/gp4/benchmark.php?test=hello&lang=all
Damn! C & C++ are killing java in this benchmark. Though I discovered
a trick that improves the speed somewhat and saves some face...
With n = 200 (i.e 200 startups in continuous order).
java hello
time: 23.433s
However, just adding the flag -XX:+AggressiveHeap
java -XX:+AggressiveHeap hello
time: 9.914s
that's a huge improvement.
- 7
- help with java assignmentWas just hoping someone could shed a bit of light on how to approach
this assignment. It would seem we have to determine the value of a in
order to determine how many times the method m() is called, but there
doesn't seem to be enough information to determine a's value. Any tips
would be greatly appreciated...
Many Thanks
For each of the following snippets of code, give the number of times
method m() is called, with a brief explanation. Assume that a and b are
nonnegative integers.
Snippet A
for (int i = a; i < a*a; ++i) {
m();
}
int i = 0; int j = a;
while (i <= j) {
++i;
m();
--j;
}
Snippet B
For this one, first we define a method m1:
public static void m1(int a) {
for (int i = 0; i <= a*a; ++i) {
m();
}
}
Now the snippet:
m1(a*a);
Snippet C
for (int i = a; i != a + b; i += 2) {
for (int j = a/2; j > 0; --j) {
for (int k = 1; k < a; ++k) {
m();
}
}
}
Snippet D
for (int i = 0; i < a; ++i) {
for (int j = 148; j < i; ++j) {
m();
}
}
- 8
- help adding items to JComboBox on the flyAnyone happen to see what I might be doing wrong. I'm trying to add
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1. User adds tree nodes to a tree.
2. Then user can select on another node elsewhere in the tree which
renders a JComboBox
and the items just added from step 1 are listed in this box.
I have a few problems ...
- after I select my item in the combobox, the combobox stays there. If
I then select on another node, the item in the combobox doesn't get
selected. It doesn't work where I just select an item and it closes up
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(I hope I've got my code snippet here w/o any typos, I had to cut it
down)
----
public class TreeEditor extends AbstractCellEditor implements
TreeCellEditor
{
private JComboBox myComboBox;
public TreeEditor() {
myComboBox = new JComboBox();
myComboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
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Integer val = (Integer) getCellEditorValue();
myComboBox.setSelectedItem(val.intValue());
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myComboBox.getSelectedItem().toString());
node.setUserObject(((MyUserObjectInfo) nodeInfo));
jTree.getModel().valueForPathChanged(path, nodeInfo);
}
});
}
public Object getCellEditorValue() {
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}
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Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
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TreeModel tModel = jTree.getModel();
Object root = tModel.getRoot();
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{
DefaultMutableTreeNode carNode =
(DefaultMutableTreeNode)e.nextElement();
Object nodeInfo = carNode.getUserObject();
nodeName = ((MyUserObjectInfo)nodeInfo).getName();
myComboBox.addItem(nodeName);
}
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myComboBox.setSelectedIndex(0);
}
return myComboBox;
}
}
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<xsd:complexType >
<xsd:complexContent>
<xsd:extension base="ResultBase">
<xsd:attribute name="Text" type="DbRef" />
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:element>
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class
{
public static void main(String[] args)
{
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}
}
then I compile it:
D:\j2sdk1.4.2_04\bin>javac test.java
test.java:1: <identifier> expected
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^
test.java:8: '{' expected
^
2 errors
D:\j2sdk1.4.2_04\bin>
my book tell me it would work well, what's wrong?
--
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